I have some memories from my college times back in the 2000s. God I miss those days! One girl in my class in particular liked wearing low rise pants. She was blonde, super skinny, very tall and had endlessly long legs as well as a beautiful face. She had real model looks on her. She started wearing low rise jeans before all the other girls, but initially made sure to wear really long tops along with them and always tugged nervously on them so nothing could be seen. However, when buttcrack showing became more popular, she started showing her buttcrack and panties regularly, but no thongs yet.
One time, we made a guided tour to some castle, and she wore her most daring pair of jeans (I already knew and loved those at the time) along with a long green sweater. I already noticed that her jeans had fallen extremely low under the sweater, they werent't sitting tightly around her ass but were sagging down her waist a lot. I guess she just didn't care because the sweater was so long. We were driving there by bus, and when we arrived and she stood up, I got a short glimpse of her deep asscrack and a white string that was wedged into it. I immediately got very excited, even though this sight vanished under her sweater again after half a second and she pulled up her pants as far as she could afterwards. I asked myself if I had actually seen a thong there. When we left the bus, she took off the sweater and left it in the bus rather than putting it around her waist. I think she really wanted to show off that day. Underneath, she had an extremely tight, white tank top with a huge cleavage that left a millimeter wide gap between the top and the waistband of her jeans. Some huge white ruffles were spilling out from that gap. She reached back to adjust her ponytail, and her top rode up, exposing the front of a white, frilly thong. The thong was pulled up extremely far, almost to her bellybutton, as if she wanted to make sure it showed no matter what, and her jeans were very low, leaving just a hint of her buttcrack uncovered when standing, even though they were almost completely pulled up. The thong was absolutely over the top, very large with ruffles everywhere, it looked more like something you would only wear in the privacy of your home. The thong was sticking out from her jeans so far, she was definitely showing it off intentionally. She adjusted her top, but since it was so short, her thong was showing no matter what. We had to climb some steep stairs to get to the castle, and her jeans fell down with every step. I couldn't take my eyes off her mesmerizing hips as she walked. She not only looked like a model, she also knew perfectly well how to move like one. She constantly pulled down her top, but it rode up again each time she took a step up the stairs. Her sexy thong was wedged inside her crack so deeply it almost looked painful. With each step she took, more of her thong was bulging out between her top and her jeans. On top of the stairs, she yanked her pants up and looked around if someone was staring at her. I had never see her wear a thong publicly before that day, and she seemed to be a bit nervous. After walking around in the gift shop for a bit and attracting lots of views, she went over to the lavatory, which cost 0,5€ or so to use. She opened her purse - and lost several coins on the floor. I couldn't believe it when she looked around quickly and then bent over to pick them up, sticking her ass high up in the air, her knees completely straight. Her tight top rode up, exposing her entire whaletail. Her jeans fell down, exposing several centimeters of buttcrack. The ruffles on her thong made it impossible to overlook, she looked like a lingerie model who just quickly threw on some ill-fitting jeans. After a while of awkward bending, she decided to crouch down entirely to reach the remaining coins. Her jeans slid down so much, she showed at least 20 cm of her thong and 4 cm of buttcrack. The whole scene was so unreal, lascivious and sexy, it could have been taken directly from an adult movie. A friend of hers that waited behind her in the queue hurried to help her, and they giggled together about how much attention she drew (At least I imagine, she was blushing and putting her hand over her thong as they were talking). They then vanished in the toilet together, and when they reappeared, the thong was pulled down a lot, just a sliver of white was still visible above her jeans. For the rest of the day, she attracted way less attention, though she still showed some buttcrack and a bit of her thong when bending over, her jeans were simply too low-cut to avoid that.
From that day on, she and her friend made a game out of how far she could go with her thong exposure. She bought at least two more, one black silk thong that was slightly see through, and a shiny silver one.
There is one other story where a teacher called her to the board in front of the class. She stood up, flashed her silver thong to the entire classroom, and then adjusted her top which was so sheer that the thong was still plainly visible underneath it. She then walked to the board, clumsily lost the chalk on the floor and bent over right in front of the teacher, who stared right at her thong, then suddenly looked away when he realized what he was doing, and acted like nothing had happened. She repeated this multiple times, even crouching down once which exposed her buttcrack as well. All the while, her friend sat there smiling and giggling and the teacher got more and more nervous. She never got called to the board again by this teacher.